"Fluctuations in Crops and Weather, 1866-1948"; USDA Statistical Bulletin No. 101, June 1951, Box: 3, Folder: 14. Personal Papers of George F. Jenks, PP 474. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/136087 Accessed May 19, 2024.